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MDS-D2/DH2 Series Instruction Manual
2.3 NC and Drive Unit Connection
(2) When using two or more power supply units within a single NC communication bus system
Two or more power supply units may be required within a single NC communication bus system if the spindle drive
unit capacity is large. The drive unit receiving power (L+, L-) from each power supply unit must always have NC
communication cable connection at the NC side of each power supply unit. In the NC communication bus
connection example below, power supply [1] cannot supply power (L+, L-) to the 5th axis servo drive unit.
For basic connection information, refer to "(1) When using one power supply unit".
Connections when using two power supply units within a single NC communication bus system
CAUTION
1. The drive unit receiving power (L+, L-) from each power supply unit must always have NC communication bus
connection at the NC side of each power supply unit.
2. If two or more power supply units are connected in the drive system, confirm that the units are not connected with each
other through the L+ and L- lines before turning ON the power. Also make sure that the total capacity of the drive units
connected to the same power supply unit meets the unit's selected capacity.
CN4
CN4
CN4
CN4
Power
cannot be
supplied
Optical
communication
cable
MDS-D2/DH2-SP
8th axis
(CV control axis)
MDS-D2/DH2-CV
[2]
MDS-D2-SP2
6th/7th axis
MDS-D2/DH2-V2
1st/2nd axis
MDS-D2/DH2-V2
3rd/4th axis
(CV control axis)
MDS-D2/DH2-CV
[1]
MDS-D2/DH2-V1
5th axis
Connected
to the NC